Saw-mill dog



(N0 Mddel.)

J. B. DAVIS.

SAW MILL DOG.

Patented Jan. 19, 1886.

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UNITED STATES PATENT OFFICE.

JOSEPH B. DAVIS, OF MONROEVILLE, INDIANA.

SAW-MILL DOG.

SPECIFICATION forming part of Letters Patent No. 334,515, dated January 19, 1886.

Application filed May 18, 1885. Serial No. 165,871. (No model.)

To all whom it may concern:

Be it known that I, J OSEPI-I B. DAVIS, a citizen of the United States, residing at Monroeville, in the county of Allen and .State of Indiana, have invented a new and useful Improvement in Saw-Mill Dogs, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to an improvement in saw-mill dogs, and it consists in the peculiar construction and combination of devices, that will be more fully set forth hereinafter, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of a saw-mill dog embodying my invention. ,Fig. 2 is a vertical sectional view of the same, taken on the line 00 x of Fig. 1. Fig. 3 is a detailed sectional view taken on the line y y of Fig. 2.

A represents a vertical bar which is to be bolted'fast to the standard of the head-block. The upper end of this bar is slotted vertically for a suitable distance, as 'ata, and from the outer side of this bar, near the lower end thereof, projects a horizontal bracket, a.

B represents a sliding bar, which is slotted at its lower end, as at b, to receive the headed end of the bracket a, and which has at its upper end a horizontal bracket, b, that is headed and enters the slot a. By this construction it will be readily understood that the bar B is permitted to slide vertically a suitable distance on the bar A.

0 represents an eccentric, the shaft 0 of which is journaled in the bar A, and projects a suitable distance beyond the rear side of the said bar. To this projecting end of the ecceir trio shaft is secured a lever, D.

E represents a rod which is pivoted at its upper end to the sliding bar B. The lower end of this rod is formed into an eccentricstrap, e, which encircles the eccentric O. A box, F, slides upon the bar B, and in the upper end of this box is j ournaled an eccentric cam, G. To this cam is secured a lever, H. When the lever His raised in the position shown in solid lines in Fig. 1, the cam is turned so as to be out of contact with the face of the bar B, and the box F is then free to be raised or lowered on said bar. \Vhen the lever H is lowered in the position shown in dotted lines in Fig. 1, the cam bears against the face of the bar B, and the box F is immovably secured to said bar. A horizontal opening is made in the lower end of the box F, and through this opening passes the extended arm t of the bit I. To the under side of this arm is secured a flat spring, K, which is provided with teeth k, that engage with an abutment or shoulder, f, that is formed in the box F. This toothed spring prevents the bit from being drawn forward except by aid of the operator; but when the bit isextended and a log rolls against it the teeth will disengage themselves and allow the bit to get in position.

The operation of my invention will be readily understood from the foregoing description and by reference to the accompanying drawings.

A saw-mill dog thus constructed is cheap and simple, is easily operated, and is thoroughly efficient in use.

I am aware "that it has been heretofore proposed to use a laterally-sliding dog having a series of notches, and a bearing-spring in combination with a mortised head having a tooth for engaging with the notches in the dog, and this construction I disclaim, My invention difl'ers from this in that I provide the dog with a toothed spring instead of having the teeth inthe dog, and by so doing I gain an impor-' tant advantage.

In the construction disclaimed, in order to adjust the dog when engaged with a log it would be necessary to press the inner end of the dog up against the pressure of the spring to release its notch from the toothed head, and thus necessarily embed the point of the dog more firmly in the log, requiring great exertion, while by simply raising the free end of my spring its teeth are disengaged and the dog released, as will be very readily understood.

Having thus described my invention, I claim- 1.. The combination, in a saw-mill dog, of the rigid bar A, having the headed bracket a and the slot a, the sliding bar B, having the slot b, in which the bracket a works, and the headed bracket 1), working in slot a, means for raising and lowering the sliding bar, the box F on said bar, having the slotted opening, the shoulder f, and the cam for clamping the box to the bar, with the dog I, the bearingspring K, fast thereto and having the teeth is In testimony that I claim the foregoing as for engaging with the shoulderf, for the purmy own I have hereto aifixed my signature in pose set forth, substantially as described. presence of two witnesses.

2. The combination of the sliding bar B, the i 5 box F on said bar, having the slotted opening, JOSEPH B. DAX'IS.

the shoulder f, and the cam for clamping the i box to the bar, with the dog I, the bearing- Witnesses: spring K, fast thereto, and having the teeth k, S. )I. \ViLLIAMs, for engaging the shoulder f, substantially as )I. STRASS.

IO described. i 

